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100Vdc current regulator?

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shortbus=

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not wanting to steal another posters thread i'll start my own.

another thread ( https://www.electro-tech-online.com/threads/aluminium-anodising-power-supply.98023/ )
is using a lm338 as a current regulator, but it is rated at a lower voltage than i need.
1- is there a way to scale or other wise use this chip at a higher voltage?

2- is there another chip that i haven't been able to find that will regulate 100vdc to 5 amps?

3- can these (if there is one) be used to control, by switching on one or more at a time, out put from a 100v @ 20 amp basic power supply
( transformer - bridge rectifier - filter cap)?

sorry for such dumb questions, cary
 
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